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BMW · Known Issues

2025 BMW 8 Series Problems: 3 Known Issues

2025 model year · 345+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 345+ owner reports, the 2025 BMW 8 Series has 3 documented known issues. None of the listed issues is rated critical; this is not a complete reliability assessment. The most commonly reported issue is N63/S63 V8 Oil Consumption in M850i with 140 owner reports. Across all issues with published estimates, repair costs range from $350 to $5,000. DIY maintenance guides at au7o.io.

In This Article

  • 8 Series Engine1
  • 8 Series Other1
  • 8 Series Suspension1
  • Recalls1
  • FAQ
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In This Article

  • Engine1
  • Other1
  • Suspension1
  • Recalls1
  • FAQ

All 3 Known Issues

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ALL YEARS2025202420232022202120202019
Community reported
140 owners

On the 2019-2025 BMW 8 Series, the M850i equipped with the N63TU4 twin-turbo V8 carries forward the oil consumption tendencies of the N63 engine family, though the TU4 revision is improved over earlier versions. Oil consumption of 1 quart per 3,000-5,000 miles is still common and considered within BMW's specification. The hot-vee turbo design inherently stresses valve stem seals and turbo oil seals. High-performance driving significantly increases consumption rates.

This issue also affects: BMW 5 Series, BMW 6 Series, BMW X5

Common Symptoms

  • Oil level dropping between 5,000-mile service intervals
  • Oil level warning on dashboard
  • Slight blue tint to exhaust on cold startup
  • Oil odor from exhaust during spirited driving
  • Need to add oil between scheduled services
  • Increased consumption during track days or aggressive driving

How to Fix

BMW considers up to 1 quart per 1,200 miles as within specification for the N63 family. For excessive consumption beyond that, inspect turbo oil return lines for restriction (causes oil to push past turbo seals), check the crankcase ventilation system, and evaluate valve stem seal condition. The N63TU4 benefits from updated seals and coatings, so consumption rarely reaches the extreme levels of earlier N63 variants.

Typical repair cost:$500 - $5,000

Research This Issue

Based on 140 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence140 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026
Community reported
110 owners

On the 2019-2025 BMW 8 Series B58, the 840i with B58 inline-six turbo engine experiences coolant loss primarily from the plastic expansion tank cracking and the electric water pump connection failing. The expansion tank develops hairline cracks at the weld seams that are nearly invisible until significant coolant is lost. The high-performance demands of the 8 Series chassis put additional thermal stress on the cooling system compared to lighter BMW models.

This issue also affects: BMW 1 Series, BMW 2 Series, BMW 5 Series

Common Symptoms

  • Low coolant warning without visible puddle
  • Coolant level gradually dropping over weeks
  • White residue or staining on expansion tank seams
  • Sweet antifreeze odor from engine bay
  • Temperature gauge reading slightly above normal
  • Steam from engine bay in cold weather (coolant evaporating on hot surfaces)

How to Fix

Replace the coolant expansion tank with BMW's latest revision. Inspect the electric water pump and all quick-connect coolant fittings for leaks. Pressure test the entire cooling system after repairs. Replace the expansion tank cap as a weak cap allows premature boiling. Use only BMW-approved blue coolant — mixing coolant types causes gel formation.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine BMW main engine-coolant expansion tank 17139485733
    OEM17138610655Cross-ref17139485733

    Confirmed leaking main engine-cooling expansion-tank replacement. Confirm VIN because the vehicle contains multiple coolant reservoirs and production revisions..

    BMW Parts Deal
  • Genuine BMW main expansion-tank cap 17117639020
    OEM17117521071Cross-ref17117639020

    Fitment: 2020-2025 BMW 840i/840i xDrive G14/G15/G16 main engine-cooling expansion tank; confirm VIN and tank/cap position before ordering because a second cooling circuit may use different hardware..

    BMW Parts Deal

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$350 - $800

Research This Issue

Based on 110 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerified110 owner reportsLast reported by owners Mar 2026Reviewed Aug 2026
Community reported
95 owners

On the 2019-2025 BMW 8 Series, the 8 Series equipped with Adaptive M Suspension experiences electronic damper failures, particularly in the rear. The electronically controlled dampers use solenoid valves to adjust firmness in real-time, and these solenoids can fail from fluid contamination or electrical faults. When a damper fails, the system defaults to the stiffest setting on the affected corner, creating a noticeably harsh and uneven ride. The car may also display a suspension warning and disable sport/comfort mode switching.

Common Symptoms

  • Suspension malfunction warning on dashboard
  • Unable to switch between Comfort, Sport, and Sport+ suspension modes
  • One corner of the car feels significantly stiffer than others
  • Clunking noise from affected corner over bumps
  • Vehicle pulling to one side under braking due to uneven damping
  • Excessive body roll on one side during cornering

How to Fix

Replace the failed adaptive damper. BMW's diagnostic system can identify which specific damper has failed through the suspension control module fault memory. The damper must be coded to the vehicle after installation. Replace dampers in pairs (both fronts or both rears) if the vehicle has over 60,000 miles, as the remaining original damper is likely near end of life. Bilstein offers OE-equivalent adaptive dampers at lower cost than BMW parts.

Typical repair cost:$800 - $2,000

Research This Issue

Based on 95 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence95 owner reportsLast reported by owners Mar 2026Reviewed Mar 2026
NHTSA Recalls1 recall

POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM)

BMW of North America, LLC (BMW) is recalling certain 2023 Toyota GR Supra, 3 Series Sedan (330i xDrive, M340i xDrive, M3), 5 Series Sedan (530i, 530i xDrive, M5), 4 Series Gran Coupe (430i, 430i xDrive), 4 Series Coupe (430i, 430i xDrive, M440i xDrive), 4 Series Convertible (430i, 430i xDrive, M440i xDrive), 8 Series Coupe (840i, M850i xDrive, M8), 8 Series Convertible (840i, M850i xDrive, M8), 8 Series Gran Coupe (850i xDrive, M8), X3 SAV (X3 xDrive30i, X3M), X4 SAV (X4 xDrive30i), X5 SAV (X5 xDrive40i, X5 M50i, X5M), X6 SAV (X6 xDrive40i, X6 M50i, X6M), and Z4 sDrive30i, Z4 M40i vehicles. The weld seam of the integrated transmission control unit's cover may not have been manufactured properly, which could allow automatic transmission oil to leak into the transmission control unit.

Campaign #23V82100006/12/2023

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

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Frequently Asked Questions

What are the most common BMW 8 Series problems?

According to Au7o's analysis of 345+ owner reports, the 2025 BMW 8 Series has 3 documented issues. The most frequently reported are: N63/S63 V8 Oil Consumption in M850i, B58 Engine Coolant Loss from Expansion Tank and Water Pump, Adaptive Suspension Damper Malfunction. None are rated critical, but regular maintenance is recommended.

Is the BMW 8 Series reliable?

The 2025 BMW 8 Series has 3 known issues documented across 345+ owner reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common BMW 8 Series problems?

Repair costs for known BMW 8 Series issues range from $350 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2019-2025 BMW 8 Series N63/S63 V8 Oil Consumption in M850i?

The M850i equipped with the N63TU4 twin-turbo V8 carries forward the oil consumption tendencies of the N63 engine family, though the TU4 revision is improved over earlier versions. Oil consumption of 1 quart per 3,000-5,000 miles is still common and considered within BMW's specif… Repairs typically run $500-$5,000. Severity: medium.

What is the 2019-2025 BMW 8 Series B58 Engine Coolant Loss from Expansion Tank and Water Pump?

The 840i with B58 inline-six turbo engine experiences coolant loss primarily from the plastic expansion tank cracking and the electric water pump connection failing. The expansion tank develops hairline cracks at the weld seams that are nearly invisible until significant coolant… Repairs typically run $350-$800. Severity: medium.

What is the 2019-2025 BMW 8 Series Adaptive Suspension Damper Malfunction?

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data sourced from 345+ owner reports, NHTSA recalls, TSBs, and automotive forums.

The 8 Series equipped with Adaptive M Suspension experiences electronic damper failures, particularly in the rear. The electronically controlled dampers use solenoid valves to adjust firmness in real-time, and these solenoids can fail from fluid contamination or electrical faults… Repairs typically run $800-$2,000. Severity: medium.